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Adsorption equilibrium of carbon dioxide on zeolite 13X at high pressures Adsorption capacity is high and at 293.15 K reaches 6.04 mol/kg for 2000 kPa. When the temperature increases, the adsorption capacity decreases, and at 393.15 K it is 4.79 mol/kg for 2000 kPa. It can be concluded that the zeolite 13X is a good adsorbent for carbon dioxide capture. The best fit to the exper- imental equilibrium data for carbon dioxide – zeolite 13X is provided by the Toth model, with a relative error of 8.57%. In the study, three equilibrium adsorption models Toth, Langmuir–Freundlich, and Langmuir were cor- related with experimental data. The Toth and Langmuir equation had four adjustable parameters and the Langmuir–Freundlich equation had eight adjustable parameters. The Toth model gave the best fit. It can provide the heat of adsorption. Langmuir–Freundlich and Langmuir models also showed a good fit for carbon dioxide – zeolite 13X. The comparison of measured experimental isotherm equilibria for the carbon dioxide-zeolite 13X system at 293.15 K with results obtained by Costa et al. (1991), Lee at al. (2002) and Ling et al. (2014) is shown in Figs. 5 to 6. Another comparison was made for isotherm measured at 323.15 K with results obtained by Fig. 5. Comparison of experimental isotherms for carbon dioxide adsorption onto zeolite 13X at 293.15 K in the whole range of pressure measurements Fig. 6. Comparison of experimental isotherms for carbon dioxide adsorption onto zeolite 13X at 293.15 K http://journals.pan.pl/dlibra/journal/98834 317PDF Image | ADSORPTION EQUILIBRIUM OF CARBON DIOXIDE ON ZEOLITE
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